Daemon: Implement monitor labels (#1861)

daemon/DBus.vala

@@ -8,8 +8,17 @@ public interface Gala.WMDBus : GLib.Object {
     public abstract void perform_action (Gala.ActionType type) throws DBusError, IOError;
 }
 
+public struct Gala.Daemon.MonitorLabelInfo {
+    public int monitor;
+    public string label;
+    public string background_color;
+    public string text_color;
+    public int x;
+    public int y;
+}
+
 [DBus (name = "org.pantheon.gala.daemon")]
-public class Gala.Daemon.MenuDaemon : GLib.Object {
+public class Gala.Daemon.DBus : GLib.Object {
     private const string DBUS_NAME = "org.pantheon.gala";
     private const string DBUS_OBJECT_PATH = "/org/pantheon/gala";
 
@@ -21,6 +30,8 @@ public class Gala.Daemon.MenuDaemon : GLib.Object {
     private WindowMenu? window_menu;
     private BackgroundMenu? background_menu;
 
+    private List<MonitorLabel> monitor_labels = new List<MonitorLabel> ();
+
     construct {
         Bus.watch_name (BusType.SESSION, DBUS_NAME, BusNameWatcherFlags.NONE, gala_appeared, lost_gala);
     }
@@ -102,4 +113,21 @@ public class Gala.Daemon.MenuDaemon : GLib.Object {
             });
         }
     }
+
+    public void show_monitor_labels (MonitorLabelInfo[] label_infos) throws GLib.DBusError, GLib.IOError {
+        hide_monitor_labels ();
+
+        monitor_labels = new List<MonitorLabel> ();
+        foreach (var info in label_infos) {
+            var label = new MonitorLabel (info);
+            monitor_labels.append (label);
+            label.present ();
+        }
+    }
+
+    public void hide_monitor_labels () throws GLib.DBusError, GLib.IOError {
+        foreach (var monitor_label in monitor_labels) {
+            monitor_label.close ();
+        }
+    }
 }

daemon/Main.vala

@@ -19,6 +19,10 @@ public class Gala.Daemon.Application : Gtk.Application {
         granite_settings.notify["prefers-color-scheme"].connect (() => {
             gtk_settings.gtk_application_prefer_dark_theme = granite_settings.prefers_color_scheme == Granite.Settings.ColorScheme.DARK;
         });
+
+        var app_provider = new Gtk.CssProvider ();
+        app_provider.load_from_resource ("io/elementary/desktop/gala-daemon/gala-daemon.css");
+        Gtk.StyleContext.add_provider_for_screen (Gdk.Screen.get_default (), app_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
     }
 
     public override void activate () {
@@ -28,7 +32,7 @@ public class Gala.Daemon.Application : Gtk.Application {
     public override bool dbus_register (DBusConnection connection, string object_path) throws Error {
         base.dbus_register (connection, object_path);
 
-        connection.register_object (object_path, new MenuDaemon ());
+        connection.register_object (object_path, new DBus ());
 
         return true;
     }

daemon/MonitorLabel.vala

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2024 elementary, Inc. (https://elementary.io)
+ * SPDX-License-Identifier: LGPL-3.0-or-later
+ */
+
+ public class Gala.Daemon.MonitorLabel : Hdy.Window {
+    private const int SPACING = 12;
+    private const string COLORED_STYLE_CSS = """
+        @define-color BG_COLOR %s;
+        @define-color TEXT_COLOR %s;
+    """;
+
+    public MonitorLabelInfo info { get; construct; }
+
+    public MonitorLabel (MonitorLabelInfo info) {
+        Object (info: info);
+    }
+
+    construct {
+        child = new Gtk.Label (info.label) {
+            margin = 12
+        };
+
+        title = "LABEL-%i".printf (info.monitor);
+
+        input_shape_combine_region (null);
+        accept_focus = false;
+        decorated = false;
+        resizable = false;
+        deletable = false;
+        can_focus = false;
+        skip_taskbar_hint = true;
+        skip_pager_hint = true;
+        type_hint = Gdk.WindowTypeHint.TOOLTIP;
+        set_keep_above (true);
+
+        stick ();
+
+        var scale_factor = get_style_context ().get_scale ();
+        move (
+            (int) (info.x / scale_factor) + SPACING,
+            (int) (info.y / scale_factor) + SPACING
+        );
+
+        var provider = new Gtk.CssProvider ();
+        try {
+            provider.load_from_data (COLORED_STYLE_CSS.printf (info.background_color, info.text_color));
+
+            get_style_context ().add_provider (provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
+            get_style_context ().add_class ("colored");
+        } catch (Error e) {
+            warning ("Failed to load CSS: %s", e.message);
+        }
+
+        show_all ();
+    }
+}

daemon/Window.vala

@@ -6,12 +6,6 @@
  */
 
 public class Gala.Daemon.Window : Gtk.Window {
-    static construct {
-        var app_provider = new Gtk.CssProvider ();
-        app_provider.load_from_resource ("io/elementary/desktop/gala-daemon/gala-daemon.css");
-        Gtk.StyleContext.add_provider_for_screen (Gdk.Screen.get_default (), app_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
-    }
-
     public Gtk.Box content { get; construct; }
 
     public Window (int width, int height) {
@@ -37,6 +31,7 @@ public class Gala.Daemon.Window : Gtk.Window {
         type_hint = Gdk.WindowTypeHint.DOCK;
         set_keep_above (true);
 
+        title = "MODAL";
         child = content = new Gtk.Box (HORIZONTAL, 0) {
             hexpand = true,
             vexpand = true

daemon/meson.build

@@ -1,15 +1,16 @@
 gala_daemon_sources = files(
     'Main.vala',
-    'MenuDaemon.vala',
+    'DBus.vala',
+    'MonitorLabel.vala',
     'Window.vala',
     'WindowMenu.vala',
-    'BackgroundMenu.vala'
+    'BackgroundMenu.vala',
 )
 
 gala_daemon_bin = executable(
     'gala-daemon',
     gala_daemon_sources,
-    dependencies: [gala_dep, gala_base_dep],
+    dependencies: [gala_dep, gala_base_dep, hdy_dep],
     include_directories: config_inc_dir,
     install: true,
 )

data/gala-daemon.css

@@ -6,3 +6,18 @@
 daemon-window {
     background-color: transparent;
 }
+
+/* For better dark style support */
+@define-color BG_COLOR_ALPHA alpha(@BG_COLOR, 0.75);
+
+.colored {
+    background-color: @BG_COLOR_ALPHA;
+    color: @TEXT_COLOR;
+    text-shadow: 0 1px 1px alpha(white, 0.1);
+    -gtk-icon-shadow: 0 1px 1px alpha(white, 0.1);
+    -gtk-icon-palette: warning white;
+}
+
+window.colored {
+    background-color: alpha (@BG_COLOR, 0.8);
+}

meson.build

@@ -94,6 +94,7 @@ gee_dep = dependency('gee-0.8')
 granite_dep = dependency('granite', version: '>= 5.4.0')
 gnome_desktop_dep = dependency('gnome-desktop-3.0')
 gsd_dep = dependency('gnome-settings-daemon', version: '>= @0@'.format(gsd_version_required))
+hdy_dep = dependency('libhandy-1')
 m_dep = cc.find_library('m', required: false)
 posix_dep = vala.find_library('posix', required: false)
 sqlite3_dep = dependency('sqlite3')

src/DaemonManager.vala

@@ -81,8 +81,31 @@ public class Gala.DaemonManager : GLib.Object {
     }
 
     private void handle_daemon_window (Meta.Window window) {
-        window.move_frame (false, 0, 0);
-        window.make_above ();
+        var info = window.title.split ("-");
+
+        if (info.length == 0) {
+            critical ("Couldn't handle daemon window: No title provided");
+            return;
+        }
+
+        switch (info[0]) {
+            case "LABEL":
+                if (info.length < 2) {
+                    return;
+                }
+
+                var index = int.parse (info[1]);
+
+                var monitor_geometry = display.get_monitor_geometry (index);
+                window.move_frame (false, monitor_geometry.x + SPACING, monitor_geometry.y + SPACING);
+                window.make_above ();
+                break;
+
+            case "MODAL":
+                window.move_frame (false, 0, 0);
+                window.make_above ();
+                break;
+        }
     }
 
     private void lost_daemon () {